Elastic metal stringing and method of making the same



Dec. 18, 1928. I

w. A. LARNED ELASTIC METAL STRINGING AND METHOD OF MAKING THE SAME Filed July 12, 1925 FIG. 2

2 Sheets-Sheet 1 IN VEN TOR,

fl beaow a Dec. 18, 1928. 1,695,595

W. A. LARNED ELASTIC METAL STRINGING AND METHOD MAKING THE SAME Filed July 12, 1923 2 Sheets-Sheet 2 IINVEN'TOR, M a. a/W4 ATTORNEY". b

Patented Dec. 18; 1928.

" WILLIAM A. ILARNEDT; orsUMMtr, NEW-Jansen].ns'sIG voa roe-rm same s'rnsn RAoQUErooMrANY, or DAYTON,

, nLns'riofgzvinr-nn Tsrnrneiive "AND a sinaaminleiiiml 12, :My inventioiifi'elate's to new and; useful improvements in'an elasticmetal stringing, and the method of mak n the same, andhas particular reference to a nine-wire stringing} that is preferably made up of three groups of three wireseach for tennis rackets and the like. v f I It is the principal object of'my ii'i-vention to provide an elastic metal stringing which is made up of wires that are first wound into groups, after which the groups themselves are wound together and then stretchedto a blockingpoint, or a point beyond which the stringinghasa maintained elasticity due to thetorsional reaction of'the groups upon In constructing this stringing I preferably employ three'groups of three wires'each,

since it. has been found that a nine-wire stringing so made up more nearly approaches the characteristics of gut without its disadvantages. In other words, such.- a stringing gives all the advantages of a gut stringing in that it has a large amount of-elasticity and a small amount of set, without the attendant disadvantages. of gut under dampness.

In the accompanying drawings illustrating my inventionpFigure 1 is a perspective View of three wires that are wound together in a group, the winding being incomplete at one end to show'the wires themselves. Figure 2 is a cross sectional view taken throughsaid I groupon the line 2 2 of Figure l. Figure 3 is a perspective View of three groups of three wires each,-showing how the groups are loosely wound together before being stretched to the blocking point for insertion in a tennis racket frame. Figure 4 is a cross Referringto the accompanying drawings for a detailed description'of my improved stringing, the numerals 1, 2 and '3 in Figure 1 designate three'wires that arepreferably of the best grade ofsteel and of uniform length, and diameter. These wires are preferably to form a group r n that the grouped nine-strand stringmg had OHIO)" a oe'aron'A'r oN or onto.

names or, Manners-insane.

1923. serial no." 651.036.

wound together left-handed without a: core.

"Three ojthe groups ai'arethen wound in the oppos te direction; or r ght-handed in thisinstancc, around a core to form a larger group 5. ihe core isthen removedto leave [Tests which have beenmade with an Olsen testingmachine showthat under a blow of a pounds, which represents "approximately average tennisfplayer, my, grouped*nine-' strand-str1ngingw1ll give better results than Under such a blow the tests showed elasticity of 8% and an elongation of 117% as compared with an elasticity of 6.6% and an elongation of 2.1% for the gutgstringunder the impact of the same force. U11.- der a blow of pounds, which represents substantially the force with which-the ball is r 70 the force with which the ball is hitfby an struck byanexceptional player, thegrouped v ine-strand stringing had an elasticity of 7 3% and an elongat onof 2.8%, and thegut stringing an elasticity of 8. 1% and an elongation of 2.6%.

nine-wire stringing has all "the advantages of gut in the Way ofa'large amount of elasticity and a small amount of elongation or set. 'Re duction in elongation prevents the jjracket ing also. presents a rough or ridged surface ,to the ball'so that it may; take a'firm' grip upon the latter in play mule-possessing.all-the advantages of gut,'- my n1ne-strand stringing hasnone'of its dls- The above tests show that my "grouped stringing from becoming soft or loosening up. L ke gut, mygroupednine-wirestring ordamp weatheras gut will. do.

I advantages, forit will not deteriorate in hot 5 Having described-my invention, I claim 1. An elastic metal stringing comprising groups ofwires that are first Wound mgether 1 infaloose state, and the n stretched toa point beyond which they Willtorsionally engage each other to providemaintained elasticity under the action of' a force. I i

' 2. Themethod of making an elastic metal j stringmg, which consists, I first, in winding individual. Wires, into groups; then winding the latter into a larger group, and then stretching the latter to a point beyond which the individual groups comprising it will torsionally engage each other to give maintained elasticity under the action of a force.

3. The method of making an elastic metal stringing, which consists, first, in winding individual wires into groups, then winding the latter around a core into a larger group, then removing the core and stretching the larger groupto a point beyond which the individual groups comprising it will torsionally engage each other to give maintained elasticity under the action of a force.

comprising it will torsionall 4. The method of making an elastic metal 15 stringing, which consists, first, in winding individual wires in one direction into groups of three, then'winding three of said groups in the opposite direction'to form a-larger group, and then stretching the latter to a point beyond which the individual groups engage each other to ive maintained elasticity under the actiono a force.

In testimony whereof I have hereunto set 2 my hand this 5th day of July, 1923.

WILLIAM A. LARNED. 

